Squat/ growth question?

It sounds like myths to me but as with most myths, there's probably some kernel of truth. If you over work yourself you'll do damage to ligaments, cartilage, and growth plates and that would slow down growth. I'd say take up squatting but don't go overboard. Weight lifting stimulates bones to become more dense and so you're bones will become thicker but I've never heard of weight lifting increasing bone length.